#include "apue.2e/include/apue.h"
#include <dirent.h>

int main(int argc, char *argv[])
{
	DIR *dp;
	struct dirent *dirp;
	if(argc != 2)
		err_quit("usage: ls directory_name");

	if((dp=opendir(argv[1]))== NULL)
		err_sys("can't open %s",argv[1]);
	
	while((dirp=readdir(dp))!=NULL)
		printf("%s\n",dirp->d_name);

	closedir(dp);
	exit(0);
}